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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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The flight crew of an air carrier medium large transport gets an RA and reacts properly as they start to climb, but then make a turn as they decide that the intruder was still closing. They did evade and report the encounter to the controller.
| Attributes | |
| ACN | 366837 |
| Time | |
| Date | 199704 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : air |
| State Reference | OH |
| Altitude | msl bound lower : 28000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zob |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 20000 flight time type : 8000 |
| ASRS Report | 366837 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 5000 flight time type : 270 |
| ASRS Report | 366820 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : far non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 5000 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
Captain flying first officer communicating. First officer called TCASII target at 1130 O'clock 8-10 mi, 1500 ft below climbing to 1000 ft below and closing rapidly head on. TCASII RA commanded climb. Captain initiated gentle climb until target showed 12 O'clock 500 ft below 1-2 mi and closing, then aggressively turned right 45 degrees off course and climbed 800 ft. First officer advised ATC of evasive action. Target passed less than 1 mi along left side, approximately 200 ft below. When clear, captain descended to FL280 and rejoined airway. Both pilots believe RA was real and aggressive evasive action averted collision.
Original NASA ASRS Text
Title: THE FLC OF AN ACR MLG GETS AN RA AND REACTS PROPERLY AS THEY START TO CLB, BUT THEN MAKE A TURN AS THEY DECIDE THAT THE INTRUDER WAS STILL CLOSING. THEY DID EVADE AND RPT THE ENCOUNTER TO THE CTLR.
Narrative: CAPT FLYING FO COMMUNICATING. FO CALLED TCASII TARGET AT 1130 O'CLOCK 8-10 MI, 1500 FT BELOW CLBING TO 1000 FT BELOW AND CLOSING RAPIDLY HEAD ON. TCASII RA COMMANDED CLB. CAPT INITIATED GENTLE CLB UNTIL TARGET SHOWED 12 O'CLOCK 500 FT BELOW 1-2 MI AND CLOSING, THEN AGGRESSIVELY TURNED R 45 DEGS OFF COURSE AND CLBED 800 FT. FO ADVISED ATC OF EVASIVE ACTION. TARGET PASSED LESS THAN 1 MI ALONG L SIDE, APPROX 200 FT BELOW. WHEN CLR, CAPT DSNDED TO FL280 AND REJOINED AIRWAY. BOTH PLTS BELIEVE RA WAS REAL AND AGGRESSIVE EVASIVE ACTION AVERTED COLLISION.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.